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LibJS: Let WrappedFunction inherit target name and length

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This is a normative change in the ShadowRealm spec.

See: b73a1dc
This commit is contained in:
Linus Groh 2022-01-24 19:14:04 +00:00
parent 886d6c62f9
commit e20efaa083
6 changed files with 119 additions and 21 deletions
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70
Userland/Libraries/LibJS/Runtime/ShadowRealm.cpp
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@ -31,7 +31,67 @@ void ShadowRealm::visit_edges(Visitor& visitor)
visitor.visit(&m_shadow_realm);
}
// 3.1.1 PerformShadowRealmEval ( sourceText, callerRealm, evalRealm ), https://tc39.es/proposal-shadowrealm/#sec-performshadowrealmeval
// 3.1.2 CopyNameAndLength ( F: a function object, Target: a function object, prefix: a String, optional argCount: a Number, ), https://tc39.es/proposal-shadowrealm/#sec-copynameandlength
ThrowCompletionOr<void> copy_name_and_length(GlobalObject& global_object, FunctionObject& function, FunctionObject& target, StringView prefix, Optional<unsigned> arg_count)
{
auto& vm = global_object.vm();
// 1. If argCount is undefined, then set argCount to 0.
if (!arg_count.has_value())
arg_count = 0;
// 2. Let L be 0.
double length = 0;
// 3. Let targetHasLength be ? HasOwnProperty(Target, "length").
auto target_has_length = TRY(target.has_own_property(vm.names.length));
// 4. If targetHasLength is true, then
if (target_has_length) {
// a. Let targetLen be ? Get(Target, "length").
auto target_length = TRY(target.get(vm.names.length));
// b. If Type(targetLen) is Number, then
if (target_length.is_number()) {
// i. If targetLen is +∞𝔽, set L to +∞.
if (target_length.is_positive_infinity()) {
length = target_length.as_double();
}
// ii. Else if targetLen is -∞𝔽, set L to 0.
else if (target_length.is_negative_infinity()) {
length = 0;
}
// iii. Else,
else {
// 1. Let targetLenAsInt be ! ToIntegerOrInfinity(targetLen).
auto target_length_as_int = MUST(target_length.to_integer_or_infinity(global_object));
// 2. Assert: targetLenAsInt is finite.
VERIFY(!isinf(target_length_as_int));
// 3. Set L to max(targetLenAsInt - argCount, 0).
length = max(target_length_as_int - *arg_count, 0);
}
}
}
// 5. Perform ! SetFunctionLength(F, L).
function.set_function_length(length);
// 6. Let targetName be ? Get(Target, "name").
auto target_name = TRY(target.get(vm.names.name));
// 7. If Type(targetName) is not String, set targetName to the empty String.
if (!target_name.is_string())
target_name = js_string(vm, String::empty());
// 8. Perform ! SetFunctionName(F, targetName, prefix).
function.set_function_name({ target_name.as_string().string() }, prefix);
return {};
}
// 3.1.3 PerformShadowRealmEval ( sourceText, callerRealm, evalRealm ), https://tc39.es/proposal-shadowrealm/#sec-performshadowrealmeval
ThrowCompletionOr<Value> perform_shadow_realm_eval(GlobalObject& global_object, StringView source_text, Realm& caller_realm, Realm& eval_realm)
{
auto& vm = global_object.vm();
@ -143,7 +203,7 @@ ThrowCompletionOr<Value> perform_shadow_realm_eval(GlobalObject& global_object,
// NOTE: Also see "Editor's Note" in the spec regarding the TypeError above.
}
// 3.1.2 ShadowRealmImportValue ( specifierString, exportNameString, callerRealm, evalRealm, evalContext ), https://tc39.es/proposal-shadowrealm/#sec-shadowrealmimportvalue
// 3.1.4 ShadowRealmImportValue ( specifierString, exportNameString, callerRealm, evalRealm, evalContext ), https://tc39.es/proposal-shadowrealm/#sec-shadowrealmimportvalue
ThrowCompletionOr<Value> shadow_realm_import_value(GlobalObject& global_object, String specifier_string, String export_name_string, Realm& caller_realm, Realm& eval_realm, ExecutionContext& eval_context)
{
auto& vm = global_object.vm();
@ -227,7 +287,7 @@ ThrowCompletionOr<Value> shadow_realm_import_value(GlobalObject& global_object,
return verify_cast<Promise>(inner_capability.promise)->perform_then(on_fulfilled, throw_type_error, promise_capability);
}
// 3.1.3 GetWrappedValue ( callerRealm, value ), https://tc39.es/proposal-shadowrealm/#sec-getwrappedvalue
// 3.1.5 GetWrappedValue ( callerRealm, value ), https://tc39.es/proposal-shadowrealm/#sec-getwrappedvalue
ThrowCompletionOr<Value> get_wrapped_value(GlobalObject& global_object, Realm& caller_realm, Value value)
{
auto& vm = global_object.vm();
@ -240,8 +300,8 @@ ThrowCompletionOr<Value> get_wrapped_value(GlobalObject& global_object, Realm& c
if (!value.is_function())
return vm.throw_completion<TypeError>(global_object, ErrorType::ShadowRealmWrappedValueNonFunctionObject, value);
// b. Return ! WrappedFunctionCreate(callerRealm, value).
return WrappedFunction::create(global_object, caller_realm, value.as_function());
// b. Return ? WrappedFunctionCreate(callerRealm, value).
return TRY(WrappedFunction::create(global_object, caller_realm, value.as_function()));
}
// 3. Return value.